Basically my advice above is shit. Sometimes I forget eleven speed road is a thing.
Hope sell "11-speed" (road) freehubs that fit the Pro4 hubs and the Pro 2 Evo 40T but not the non-40T Pro 2 Evo or earlier.
The Hope 11s freehub has an extra pocket at the hub end of each splinegap.
http://www.hopetech.com/11-speed-compatibility/
Yea. I've got a Pro 2 evo with an 11 speed freehub on it that requires a little spacer for ten speed shiz. And 11 speed MTB shiz presumably.
Maybe Shimano will silently make the factory MTB wheelbuilds 11 speed road compatible like Mavic do. Who knows.
@Emyr started
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Basically my advice above is shit. Sometimes I forget eleven speed road is a thing.